Concentrator.



1. B. GREEN.

CONCENTRATOR.

APPLICATION FILED 1Au.26. 191e.-

Patented Feb. 20, 1917.

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/n/l/E/vToR Josgb/z B. reezz WITNESS A TTOR/VE Y l. B. GREEN.

CONCENTRATOH.

APPLICATION FILED 1AN. 25. 191e.

Peeeneed Feb.20,1917.

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WITNESS W A TTOR/I/EV JOSEPH B. GREEN, or SEATTLE, wasRINGToN, AssIGNoR Tol G. a. HENKEL, 0E i ARLINGTON, OREGON.

To all whom t may concern.'

Beit known that I, JosEri-r B. GREEN, a

auriferous earth of placer mines, and theV object of my invention isto provide a concentrator which shall be adapted efiiciently and cheaply to eliminate the stones and lighter non-gold-bearing portions of the earth of a placer mine from the heavier portions which carry the gold values thereof and then conduct such concentrated heavier portions into the receiving end of a goldsaving device, as, for instance, into the distributing box of one of my gold-saving devices which is illustrated and described in United States Letters Patent No. 1,123,188 granted to me on date of December 29, 1914, which gold-saving device may be operated toextract all of the gold contained in said concentrated heavier portions.

I accomplish this object by devices illustrated in the accompanying drawings, wherein Figure 1 is a plan view of a structure embodying my invention; Fig. 2 lis a view of the same in vertical section on broken line w, :r of Fig. 1; Fig. 3 is a view of the same'in` vertical section on broken line Q, g/ of Fig. 1; Fig. 1 is a view of the same in vertical section on broken line a, .a of Fig. l; Fig. 5 is a view of the same in cross-section on broken line u, u of Fig. 1; Fig. 6 is a view of the same in cross-section on broken line o, o of Fig. 1; Fig. 7 is a View ofthe same in cross-section .on broken line w, fw of Fig; 1; Fig. 8 is a view in side elevation of details of my invention associated with another detail thereof, which other detail is shown in cross-section, while Fig. 9 is a view in side elevation of said first nameddetails showing a modied form of said other detail in cross-section.

Referring to the drawings, throughout which like reference numerals indicate like parts, 10 is a sluice box which is downwardly declined to adapt it to conduct water carrying minerall bearing earth ofa placer mine on to the higher end portion `of a screening rack comprising downwardly decoNcEN'rRA'roR. Y

Specification of Letters'Patent.. Patented Feb, 20, 1917. Application led January 2G, 1916. Serial N o. 74,322.

clined removable iron grizzly-bars 11 which are supported by cross-bars 17 and 49 which are disposed to extend between the inner surfaces of the opposite side walls 12 and 13 of a downwardly declined receptacle 17 upon whose bottom wall 15 are disposed a plurality of transversely disposed riHe-bars 16 of T shaped cross-section that are spaced from each other, as 'more clearly shown in Fig. 8.

The lower yend of thevreceptacle 17 is connected with a chute 18 which extends obliquely therefrom in a its bottom 19 being Hush with the top surfacepf the lowest one of the riflie-bars '1G whereby stone and the coarser pieces of the mineralized earthy material, which cannot pass between the grate-bars 11 nor between the rifie-bars 16, will be conducted intol said chute 18 to be carried therethrough to a desired point.

Extending through the right hand sidek wall 13 of the receptacle 17 are a plurality of holes 20 which. lead into a downwardly declined sluice box 21 and through whichlighterand smaller pieces of the earthy material may be carried by waterinto said sluice box 21 which leads into the higher left hand direction, l

end of a downwardly declined receptacle 22.

On the outside surface of the right hand side wall 13 of the receptacle 17 is a plate 23 which is adapted to be adjusted vertically to vary thc cross-sectional area of the holes 20 thus to control the.. flow of water and ca rth y material therethrough.

` Upon the floor of the receptacle 22 is disposed an iron riflle member 24; which extendsthroughout the length of said receptacle 22 and `from the right hand side wall 2G lto a line at such distance fromthe left hand side wall 28 as will form a gutter, as shown in Fig. 1. l l. A

The top side of the riffle member 24 is serrated by grooves of angular cross-section, as grooves 25, which grooves 25 are disposed .to extend obliquely downward from the side terial may flow from said gutter 27 and from said pockets 29 into said sluice box 30.

vof T shaped said chute 31 extending obliquely to the .right to a convenient pointY for the disposal of tailings.

The sluice box o0 is connected at its lower end with another downwardly declined receptacle 32 and disposed on its floor is an iron riiile member 33, which is like the iron i'iflie member 24, except that its grooves are smaller in crosssection and larger in number, and said rif'le member 33 extends from the right hand wall 34 of the receptacle 32 to a line at such distance from the opposite fall 35 as will form a gutter 36, within the floor of such gutter 36 are pockets 87 from which extend passageways through the bottom portion of the side wall 35,' which passageways lead in to a downwardly declined sluice box 38.

The lower end of said receptacle 32 connects with a chute 39 into which may pass lighter' and coarser earthy material and water which has not passed into the gutter 36 to -be carried through the passageways from the pockets 37 into said sluice box 38,

said chute 39' being extended obliquely toV the right to a convenient point for the disposal ofv tailings.

rlhe sluice box 3S is connected at its lower y end with a downwardly declined receptacle 40 upon the bottom of which are trans- Verselyrdisposed a plurality of riiile-bars 41 cross-section, between which riflie-bars 41 the finer and heavier particles of the mineral bearing earthy material carried by water may fall to the bottom of said receptacle 40 te pass therefrom outwardly through holes 42, formed in the side wall of the receptacle 40, into a sluice box 44 which may conduct `each concentrated mineral bearing earthy material into a gold saying device, not shown, while the lighter non-mineral bearing portion of said earthy material will be carried by water over the tops of said little-bars 41 to be discharged into a chute 45 that is connected to the lower lend of the receptacle 46, which chute 45 may be extended to a convenient point for disposal of tailings. j 4 v rlhe holes 42 in the side wall 43, like the holes 2O in the side wall 13 of the receptacle 17 may be obstructed to a desired degree by a vertically adjustable boa rd 46 disposed on the outside surface of said side wall 43, thus to control the flow of water and the concentrated earthy material through said holes 42.

The iron grizzly-bars 11 are supported at their upper ends by the cross-bar 47 to which they are fastened by screw-bolts, as indicatedy in Figs. 1 and 3, each of which crossbars 47 is fastened at each end to the inner side of the side walls 12 and 13 respective y,

are secured to the longitudinally slotted crossbar 49 which also is secured to the inner sides ofi-the Vertical walls 12 and 13, as more clearly shown in Fig. 5.

ln Fig. 9, l have shown a grizzly-bar 50 which constitutes a modification of the grizzly-bar 1l, and which in crosssection is formed to adapt it to be securely held n tS position upon the top end portion'of astrid :31 which corresponds in function to the stud 4S, the top end portion of said stud 51 being groored to receive and hold the inwardly turned flanges formed on the under side of said grate-bar 50', while the lower end portion of said stud 51 is secured to a crossebar 52 which corresponds in function to tie cross-bar 49.

rlhe modified form of the grizzly-bar 5() and the modified form of the stud 51, although more expensive to make, may be preferable since the lower end of such sly-bar 50 will be more securely held in its position. than will the grizzly-bar 11.

The operation of my concentrator thus illustrated and described may be explained as follows: An ample sluice head of water is supplied to the sluice box 10, and then mineral bearing earth of a placer mine is shoveled or fed into said sluice box 10 to be carried by the water flowing therein to the receptacle 17 to end portion of the grate-bars 11, whereupon such portions of said earthy material as consist of stones which are too large to fall between said griZZly-bar 11 will be carried throughout the length of said grate-bars 11 to be discharged into the chute 18, while the portions of such earthy material that fall between said grate-bars 11 are subjectedto the washing action of the lrifl'le-bars 1G and then pass outwardly through the holes 2O into the sluice box 21 to be conducted thereby into the receptacle 22 to fall on to the upper end of the riflle member 24, and the lighter and coarser non-mineral bearing portions of said earthy material will be carried by water over said riftle member 24 throughout its length to be discharged into the Achute 31, while the finer and heavier mineral bearing portions of said earthy material will be diverted sidewise to fall into the gutter 27, thence into the pockets 2f) and through the passageways therefrom into the sluice box to be conducted thereby into the receptacle 32 to fall on the upper end of the riitle member 38 whereupon other lighter be discharged onto the upper material will be diverted sidewise into the gutter 36 to be carried thence into the pockets 37 and through the passageways therefrom into the sluice box 38 to be conducted into the receptacle 40 to fall upon the upper end of the series of transversely disposed riffle-bars 41 to be subjected to the action of said riille-bars 41, whereby the non-mineralized lighter portions of said earthy material will be carried over said rilfle-bars 41 to be discharged into the chute 45, while all of the mineral bearing heavy portions of said earthy` material, now

constituting a highly concentrated mineralized mass of earthy material, will fall between said rifHe-bars 41 to the bottom of the receptacle 40, thence to becarried therefrom through the passageways42 into the sluice box 44 to be conducted thereby into a gold saving device that will serve to separatev the mineral values contained in said highly concentrated mineralized earthy material; for instance, the sluice box 44 might be extended to conduct such concentrated mass of mineral bearing earthy material into the receiving end of a gold saving device like that described and illustrated in United States Letters Patent 1,123,188, granted to me on date of December 29, 1914, for gold saving device, whereby there could be segre-v gated all the gold contained in such concentrated mass of earthy material.

Manifestly, changes may be made in the forms, dimensions and arrangement Vof parts of my invention without departing from the spirit thereof.

What I claim is:

1. In an ore concentrator including -a sluice, the combination with longitudinallyextending grizzly bars, of a plurality of transversely extending riiie bars mounted upon. the sluice bottom beneath and spaced from the grizzly bars, said riflle bars being T-shaped in cross-section and being in successively lower horizontal planes with the upper faces'declined rearwardly.

2. In an ore concentrator including a sluice, the combination with longitudinallyextending grizzly bars, of transversely extending rifl'le bars mounted on the sluice bottom and having Hat upper faces and positioned beneath and spaced from the grizzly bars, the grizzly bars and upper faces of the riflie bars being arranged at acute angles with the rilile bars reversely inclined whereby the forward progress of material through the concentrator is retarded.

In witness whereof, I hereunto subscribe my name this fifteenth day of January,

A. D., i916.

JOSEPH B. GREEN. Witnesses:

FRANK WARREN, O. JOHNSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.2 

